Here's one.
I have finished my first ever screenplay, The Silver Lotus*, weighing in at a nominal 97 pages. I felt great about myself.
That was over a month and a half ago. Now it's time for the rewrite. Tighter writing, cleaner writing, improved scenes, enhanced dialogue, subtext, proper transition, straightening the facts out... you get the picture. To make matters worse, I still haven't gotten around to an agent yet or even a marketing strategy for my screenplay.
Quick joke:
What's the difference between writing a screenplay and rewriting a screenplay?
The difference the between the first half and second half of A Clockwork Orange.
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*For anyone interested, I can PM you the summary. Sharing one's literary achievements is a great way to ease frustration.